CN107384351A - A kind of double slug compounding profile control agents of hypotonic duct type oil reservoir and its application method - Google Patents
A kind of double slug compounding profile control agents of hypotonic duct type oil reservoir and its application method Download PDFInfo
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- CN107384351A CN107384351A CN201710663704.0A CN201710663704A CN107384351A CN 107384351 A CN107384351 A CN 107384351A CN 201710663704 A CN201710663704 A CN 201710663704A CN 107384351 A CN107384351 A CN 107384351A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Abstract
A kind of double slug compounding profile control agents of hypotonic duct type oil reservoir and its application method, are related to field use chemical field.The present invention is injected in hypotonic duct type oil reservoir by double slug forms, preposed attributives mixing sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), calgon, sodium sulfite, salicylic acid, aluminium citrate, with low viscosity, the characteristic that mobility is strong, anti-shear ability is strong, the hypertonic duct in oil reservoir inside can be implemented to block；Rearmounted slug is compound surfactant, implements surfactant flooding to the duct without closure, to reduce residual oil content in oil reservoir, increase oil reservoir injectivity index, improves the phenomenon that wax, colloid, asphalitine deposit near wellbore zone；Improve Reservoir Heterogeneity by way of double slug combinations, increase sequent water flooding sweep efficiency, suppress hypotonic duct type oil reservoir region of bypassed oil and formed, to improve traditional oil production method to drawbacks such as the hypotonic low, deficiencies in economic performance of duct type oil recovery.
Description
Technical field
The present invention relates to a kind of double slug compounding profile control agents of hypotonic duct type oil reservoir and its application method, the profile control agent to change
Kind reservoir adaptability, and then hypotonic duct type oil reservoir oil increasing effect can be improved, belong to field use chemical agent field.
Background technology
The waterflood recovery efficiency factor aggregate level of China's onshore oil field is relatively low, and generally below 50%, one of its major reason is water
The sweep efficiency of drive is relatively low；A key factor for influenceing water drive sweep efficiency is anisotropism；Hypotonic duct type oil reservoir has
Permeability is low, pore throat is wide and the feature of microcrack development, due to the complexity and rock surface property of pore structure, hypotonic duct
Type oil reservoir equally exists anisotropism；So that during water drive, the propulsion of water equably piston type can not advance, and cause to inject water along height
Infiltration layer section is advanced by leaps and bounds, and local water breakthrough phenomenon occurs, so as to reduce the sweep efficiency of injection water, constrains waterflood recovery efficiency factor.
Traditional method is that its duct is blocked then to carry out water drive, in such a method, simple profile control and follow-up
Water drive be often difficult in adapt to the complexity of reservoir, phenomena such as causing the small-scale water breakthrough after closure, fingering so that further carry
The difficulty of high water-flooding performance is larger.
Recovery efficiency technique demand is improved for hypotonic duct type oil reservoir, the present invention provides a kind of double slug compounding profile control agents,
It is set forth above for solving the problems, such as.
The content of the invention
It is an object of the invention to provide a kind of double slugs of hypotonic duct type oil reservoir to compound profile control agent and its application method, this
Invention is injected in hypotonic duct type oil reservoir by double slug forms, preposed attributives mixing sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA),
Calgon, sodium sulfite, salicylic acid, aluminium citrate, there is low viscosity, the characteristic that mobility is strong, anti-shear ability is strong, can
The hypertonic duct in oil reservoir inside is implemented to block；Rearmounted slug is compound surfactant, implements surface to the duct without closure
Surfactant flooding, to reduce residual oil content in oil reservoir, increase oil reservoir injectivity index, improve wax, colloid, asphalitine in nearly well
Phenomenon with deposition；Improve Reservoir Heterogeneity by way of double slug combinations, increase sequent water flooding sweep efficiency, suppress low
Seepage hole channel type oil reservoir region of bypassed oil is formed, and to improve, traditional oil production method is low to hypotonic duct type oil recovery, deficiency in economic performance
Etc. drawback.
To reach above-mentioned purpose, the present invention adopts the following technical scheme that.
A kind of double slug compounding profile control agents of hypotonic duct type oil reservoir, its main component are：Partially hydrolyzed polyacrylamide (PHPA) phase
It is 400*10 to molecular weight4, sodium metasilicate, calgon, sodium sulfite, salicylic acid, aluminium citrate, coco-nut oil fatty acid diethyl
Alkylolamides, dodecyl sodium sulfate；For hypotonic duct type oil reservoir, double slug formula profile control agents are designed, below with slug A profile control agents
It is described with slug B.
Slug A profile control agents include sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), calgon, sodium sulfite, salicylic acid,
Aluminium citrate；Wherein polyacrylamide molecular mass is 400*104；In slug A profile control agents, sodium metasilicate mass ratio is 1%-2%,
Partially hydrolyzed polyacrylamide (PHPA) mass ratio is 0.05%-0.15%, and calgon mass ratio is 0.2%-0.4%, sulfurous acid
Sodium mass ratio is 0.4%-0.6%, and salicylic acid mass ratio is 0.1%-0.3%, and aluminium citrate mass ratio is 0.15%-
0.25%, remaining components are preparation water.
Preferably, in slug A profile control agents, sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), calgon, sodium sulfite, water
Poplar acid, aluminium citrate mass ratio are 1.2%-1.8%：0.08%-0.12%：0.25%-0.35%：0.45%-0.55%：
0.15%-0.25%：0.18%-0.22%, remaining components are preparation water.
It is highly preferred that in slug A profile control agents, sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), calgon, sodium sulfite,
Salicylic acid, aluminium citrate mass ratio are 1.5%：0.1%：0.3%：0.5%：0.2%：0.2%, remaining components are preparation water.
Slug A profile control agent main function mechanism is that sodium metasilicate is as slug A profile control agent hosts, and gel-forming property is good, flowing
Property strong, plastic before viscosity it is low, and possess certain saline-alkaline tolerance, formation water salinity influences smaller on sodium metasilicate；Partial hydrolysis
Polyacrylamide play auxiliary profile control agent effect, by by sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), aluminium citrate mix can shape
Glomeration cross-linked structure, there is high viscoplasticity, high rheological variation feature, flowed through in oil reservoir adsorbable in duct during macropore
Wall, implement firm closure to duct in oil reservoir；Aluminium citrate has delayed gelation, colloid physical property stabilization, broken glue as crosslinking agent
Time length, salt tolerance effect；The oxygen that sodium sulfite can suppress in process for preparation and in oil reservoir as oxygen scavenger produces to profile control agent
Viscosity reduction effect, so as to strengthen the stability of profile control agent；Calgon plays dispersant effect, can make sodium metasilicate, part water
Polyacrylamide is intermolecular in aqueous more uniformly spreads for solution, increase molecular coil periphery absorption affinity, so as to improve profile control
Plugging effect of the agent in duct；Salicylic acid plays regulation base fluid acidity effect, is firstly added in configuration process, make its with
Underwater gold category ion processed is combined, reduce due to prepare in water salinity it is high caused by precipitation, flocculation, it is same to have necessarily
Crosslinked action；Slug A is mainly used as blocking the hypertonic region in hypotonic duct type oil reservoir or macropore, improves hypotonic duct type
The anisotropism of oil reservoir so that follow-up slug B can enter in the duct without closure, so as to form double slug synergies.
Slug B includes cocoanut fatty acid diethanolamide and dodecyl sodium sulfate；In slug B, coco-nut oil fatty acid
Diglycollic amide mass ratio is 1%-2%, and dodecyl sodium sulfate mass ratio is 1%-2%, and remaining components are preparation water.
Preferably, in slug B, cocoanut fatty acid diethanolamide, dodecyl sodium sulfate mass ratio are 1.3%-
1.7%：1.3%-1.7%, remaining components are preparation water.
It is highly preferred that in slug B, cocoanut fatty acid diethanolamide, dodecyl sodium sulfate mass ratio are 1.5%：
1.5%, remaining components are preparation water.
Slug B main function mechanism is, by nonionic surfactant cocoanut fatty acid diethanolamide with it is cloudy from
Sub- surfactant dodecyl sodium sulfate compound synergic, plays surfactant cooperative effect；Compound surfactant solution
With relatively low surface and interface tension force, and stronger wettability, rock hydrophily can be improved, reach washing oil mesh indirectly
, to reduce residual oil content in oil reservoir, increase oil reservoir injectivity index；Two kinds of surfactant compounds, its salt resistance energy can be increased
Power, different types of stratum water can be adapted to；And two kinds of surfactant compound application effects are better than single surface-active
Agent；After slug A forms effectively closure, slug B is injected into oil reservoir, can enter and not involve duct progress surfactant flooding, with
Reduce residual oil in duct to block to caused by oil reservoir, strengthen its flow conductivity；The present invention is changed by way of double slug combinations
Kind Reservoir Heterogeneity, increases sequent water flooding sweep efficiency, suppresses hypotonic duct type oil reservoir region of bypassed oil and formed, and pass through follow-up water
Drive is further developed to oil reservoir.
The application method of the double slug compounding profile control agents of a kind of hypotonic duct type oil reservoir, it is characterised in that comprise the following steps：
Step 1. combines oil field actual production design data profile control agent injection rate, injection rate and other injection parameters；
Step 2. carries out sudden and violent oxygen processing to preparing water, prepares water and uses oilfield sewage or source water, is dissolved preparing in water
Oxygen content
It is reduced to below 3mg/L；
Under the conditions of 15-55 DEG C of step 3. temperature range, in the mixing container, medicament is added to preparing in water, is at the uniform velocity stirred
4-6
Hour, obtain profile control agent；
Water injection well is connected by step 4. with stainless steel and supercharging device, starts supercharging device, profile control agent is injected into oil reservoir；
Static 18-24 hours make the abundant plastic of profile control agent after step 5. slug A profile control agent injection rates reach preset range；
Step 6. injects driven water-replacing 0.2PV, injects slug B, then carries out follow-up note and adopts operation.
The specific injection rate of profile control agent is：Slug A profile control agent 0.3PV are injected first into oil reservoir or rock core, wait 18-24 small
When make the abundant plastic of slug A profile control agents, then in oil reservoir or rock core inject driven water-replacing 0.2PV, then in oil reservoir or rock core
Slug B0.2-0.3PV is injected, follow-up note is then carried out and adopts operation.
The present invention the advantage is that relative to prior art：
1st, in slug A, sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), aluminium citrate mixing can form spherical cross-linked structure, have
There are high viscoplasticity, high rheological variation feature, flowed through in oil reservoir adsorbable in duct inwall during macropore, duct in oil reservoir is implemented
Firm closure.
2nd, in slug A, calgon plays dispersant effect, can make sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA) in water
More uniformly spread between molecules in solution, increase molecular coil periphery absorption affinity, so as to improve closure of the profile control agent in duct
Effect.
3rd, in slug A, the oxygen that sodium sulfite can suppress in process for preparation and in oil reservoir as oxygen scavenger produces to profile control agent
Viscosity reduction effect, so as to strengthen the stability of profile control agent.
4th, in slug B, nonionic surfactant cocoanut fatty acid diethanolamide and anion surface active are passed through
Agent dodecyl sodium sulfate compound synergic, plays surfactant cooperative effect, and its application effect is better than single surfactant,
The phenomenon that wax, colloid, asphalitine deposit near wellbore zone can be improved, and the hydrophily of oil reservoir can be improved.
5th, the present invention by double slugs inject form, improve hypotonic duct type Reservoir Heterogeneity, recovery percent of reserves it is low, water suction
Index is low and water injection pressure is big, increases sequent water flooding sweep efficiency, suppresses region of bypassed oil generation, to improve traditional oil production method to low
The drawbacks such as seepage hole channel type oil recovery is low, deficiency in economic performance.
Embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
The partially hydrolyzed polyacrylamide (PHPA) used in following embodiments produces for Daqing Refinery company of CNPC, relative point
Protonatomic mass is 400*104, effective mass fraction is 90%；Sodium metasilicate produces for Laiyang economic and technological development zone Fine Chemical Works,
Analyze pure；Calgon produces for Shandong Ding Xin bio tech ltd, and 98%；Sodium sulfite is that Tianjin causes remote chemistry
Reagent Co., Ltd produces, and analysis is pure；Salicylic acid produces for Nanjing chemical reagent limited company, and analysis is pure；Aluminium citrate
Produced for Jinan Xin Ya Chemical Co., Ltd.s, top pure grade GR；Cocoanut fatty acid diethanolamide is the small chemical share in open country in Shandong
Co., Ltd produces, and analysis is pure；Dodecyl sodium sulfate produces for Nanjing chemical reagent limited company, analyzes pure AR.
Profile control agent plugging effect is evaluated by laboratory core experimental method, it is specific as follows：
Embodiment one：
1st, profile control agent application method：(1) sudden and violent oxygen processing is carried out to preparing water first, will prepare content of oxygen dissolved in water reduces
To below 3mg/L；(2) under the conditions of 15 DEG C of temperature, medicament is added to preparing in water, at the uniform velocity stirs 4 hours, obtains profile control agent；(3)
Profile control agent is directly injected into rock core after the completion of preparation.
2nd, water is prepared, is 500mg/L by adding NaCl into distilled water and adjusting to salinity, to make in simulated production
Source water.
3rd, concrete medicament application amount is：
Slug A：Sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), calgon, sodium sulfite, salicylic acid, citric acid aluminum
Amount is than being 1.5%：0.1%：0.3%：0.5%：0.2%：0.2%, remaining components are preparation water.
Slug B：Cocoanut fatty acid diethanolamide, dodecyl sodium sulfate mass ratio are 1.5%：1.5%, remaining group
It is divided into preparation water.
4th, specific rock core manufacture scale is as follows：
Experiment rock core is quartz sand epoxy resin cementitious homogeneous artificial core, and specific size is 4.5cm*4.5cm*
30cm, perm-plug method 20*10-3μm2, and the zink rod of 5% volume fraction is uniformly added into rock core manufacturing process, it is long
The high 0.05mm of the wide 0.1cm of 0.3cm, to simulate oil reservoir duct；Mould is carried out to hypotonic duct type oil reservoir by manually manufacturing rock core
Intend.
5th, displacement oil is crude oil, viscosity 45mPa.s in the case of 30 DEG C.
6th, sealing characteristics test operating procedure is as follows：
(1) rock core to be used is put into acidproof core holding unit, positive displacement, 30% concentration dilute sulfuric acid of displacement, until
Continue to inject dilute sulfuric acid 5PV, distilled water 5PV after producing without gas in rock core, to ensure that zink rod total overall reaction is discharged with dilute sulfuric acid,
Rock core is taken out after injection；
(2) rock core to be used is put into 70 DEG C of insulating boxs and is dried to constant weight, weighed its quality after taking out cooling, be designated as
m1；
(3) rock core after drying is put into saturation in vacuum pumping device and prepares water, when observation core surface bubble-free generates
Stop pumping, surface water is removed into rock core taking-up wiping, weighed, quality is designated as m2；
(4) rock core that saturation is configured to water is put into core holding unit, adds confined pressure 4MPa, then with 2mL/min speed
Into rock core, injection configuration water, records the pressure and flow when pressure stability；
(5) the positive injection slug A profile control agent 0.3PV into rock core, record pressure during injection profile agent, stand 24 hours
It is stand-by；
(6) water drive is carried out with 2mL/min speed, record outlet brings out the first breakthrough pressure when dripping, and treats that pressure is steady
The time recording pressure and flow；
(7) whole experiment is carried out in the case of 30 DEG C of constant temperature, is permeated after calculating original permeability according to record result, block up
Rate, sealing ratiod, breakthrough pressure gradient, resistance coefficient.
7th, sealing characteristics evaluation such as following table
Permeability is permeability after zink rod discharge before stifled, from the above in can draw, slug A profile control agents are to simulation core
Profile control effect is obvious, simulation duct formed firm closure, non-sealing region still has certain fluidity, illustrate the profile control agent and
Simulate source water to combine without negative effect, and seepage channel is left for follow-up slug B.
8th, oil-displacement capacity test operating procedure is as follows：
(1) rock core to be used is put into acidproof core holding unit, positive displacement, 30% concentration dilute sulfuric acid of displacement, until
Continue to inject dilute sulfuric acid 5PV, distilled water 5PV after producing without gas in rock core, to ensure that zink rod total overall reaction is discharged with dilute sulfuric acid,
Rock core is taken out after injection；
(2) rock core to be used is put into 70 DEG C of insulating boxs and is dried to constant weight, weighed its quality after taking out cooling, be designated as
m3；
(3) rock core after drying is put into saturation in vacuum pumping device and configures water, when observation core surface bubble-free generates
Stop pumping, surface water is removed into rock core taking-up wiping, weighed, quality is designated as m4；
(4) with 1.5mL/min speed into rock core saturation crude oil, be driven to the port of export no longer water outlet when termination of pumping, record is tired
Count water yield, stand 4 hours it is stand-by；
(5) rock core of the complete crude oil of saturation being put into core holding unit, whole process experiment is carried out in the case of 30 DEG C of constant temperature, with
2mL/min speed carries out water drive oil, be driven to the port of export it is no longer fuel-displaced when termination of pumping, record oil pump capacity and recovery ratio；
(6) with the positive injection slug A profile control agent 0.3PV of 0.9mL/min speed, placed 18 hours after having noted, then note
Enter to prepare water 0.2PV, be subsequently injected into slug B0.2PV, termination of pumping；
(7) positive water drive experiment is carried out, stops experiment when being driven to aqueous 98%, records oil pump capacity, and it is final to calculate rock core
Recovery ratio value.
9th, oil-displacement capacity evaluation such as following table：
Learnt from above-mentioned data, prepare profile control agent using simulation source water, displacement is carried out in the case of 30 DEG C of oil reservoir is simulated
Experiment, after implementing profile control to simulation core, rock core anisotropism is improved, has improved recovery ratio 25.66%, illustrate profile control of the present invention
Agent can improve hypotonic duct type Reservoir Heterogeneity, and profile control effect is obvious.
Embodiment two：
1st, profile control agent application method：(1) sudden and violent oxygen processing is carried out to preparing water first, will prepare content of oxygen dissolved in water reduces
To below 3mg/L；(2) under the conditions of 35 DEG C of temperature, medicament is added to preparing in water, at the uniform velocity stirs 5 hours, obtains profile control agent；(3)
Profile control agent is directly injected into rock core after the completion of preparation.
2nd, water is prepared, is 8000mg/L by adding NaCl into distilled water and adjusting to salinity, to simulate actual life
The oilfield sewage used in production.
3rd, concrete medicament application amount is：
Slug A：Sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), calgon, sodium sulfite, salicylic acid, citric acid aluminum
Amount is than being 1%：0.05%：0.2%：0.4%：0.1%：0.15%, remaining components are preparation water.
Slug B：Cocoanut fatty acid diethanolamide, dodecyl sodium sulfate mass ratio are 1%：1%, remaining components are
Prepare water.
4th, specific rock core manufacture scale is as follows：
Experiment rock core is quartz sand epoxy resin cementitious homogeneous artificial core, and specific size is 4.5cm*4.5cm*
30cm, perm-plug method 20*10-3μm2, and the zink rod of 5% volume fraction is uniformly added into rock core manufacturing process, it is long
The high 0.05mm of the wide 0.1cm of 0.3cm, to simulate oil reservoir duct；Mould is carried out to hypotonic duct type oil reservoir by manually manufacturing rock core
Intend.
5th, displacement oil is crude oil, viscosity 55mPa.s in the case of 50 DEG C.
6th, sealing characteristics test operating procedure is as follows：
(1) rock core to be used is put into acidproof core holding unit, positive displacement, 30% concentration dilute sulfuric acid of displacement, until
Continue to inject dilute sulfuric acid 5PV, distilled water 5PV after producing without gas in rock core, to ensure that zink rod total overall reaction is discharged with dilute sulfuric acid,
Rock core is taken out after injection；
(2) rock core to be used is put into 70 DEG C of insulating boxs and is dried to constant weight, weighed its quality after taking out cooling, be designated as
m5；
(3) rock core after drying is put into saturation in vacuum pumping device and prepares water, when observation core surface bubble-free generates
Stop pumping, surface water is removed into rock core taking-up wiping, weighed, quality is designated as m6；
(4) rock core that saturation is configured to water is put into core holding unit, adds confined pressure 4MPa, then with 2mL/min speed
Into rock core, injection configuration water, records the pressure and flow when pressure stability；
(5) the positive injection slug A profile control agent 0.3PV into rock core, record pressure during injection profile agent, stand 18 hours
It is stand-by；
(6) water drive is carried out with 2mL/min speed, record outlet brings out the first breakthrough pressure when dripping, and treats that pressure is steady
The time recording pressure and flow；
(7) whole experiment is carried out in the case of 50 DEG C of constant temperature, is permeated after calculating original permeability according to record result, block up
Rate, sealing ratiod, breakthrough pressure gradient, resistance coefficient.
7th, sealing characteristics evaluation such as following table
Permeability is permeability after zink rod discharge before stifled, from the above in can draw, slug A profile control agents are to simulation core
Profile control effect is obvious, simulation duct formed firm closure, non-sealing region still has certain fluidity, illustrate the profile control agent and
Simulating oil field produced water is combined without negative effect, and leaves seepage channel for follow-up slug B.
8th, oil-displacement capacity test operating procedure is as follows：
(1) rock core to be used is put into acidproof core holding unit, positive displacement, 30% concentration dilute sulfuric acid of displacement, until
Continue to inject dilute sulfuric acid 5PV, distilled water 5PV after producing without gas in rock core, to ensure that zink rod total overall reaction is discharged with dilute sulfuric acid,
Rock core is taken out after injection；
(2) rock core to be used is put into 70 DEG C of insulating boxs and is dried to constant weight, weighed its quality after taking out cooling, be designated as
m7；
(3) rock core after drying is put into saturation in vacuum pumping device and configures water, when observation core surface bubble-free generates
Stop pumping, surface water is removed into rock core taking-up wiping, weighed, quality is designated as m8；
(4) with 1.5mL/min speed into rock core saturation crude oil, be driven to the port of export no longer water outlet when termination of pumping, record is tired
Count water yield, stand 4 hours it is stand-by；
(5) rock core of the complete crude oil of saturation being put into core holding unit, whole process experiment is carried out in the case of 50 DEG C of constant temperature, with
2mL/min speed carries out water drive oil, be driven to the port of export it is no longer fuel-displaced when termination of pumping, record oil pump capacity and recovery ratio；
(6) with the positive injection slug A profile control agent 0.3PV of 0.9mL/min speed, placed 20 hours after having noted, then note
Enter to prepare water 0.2PV, be subsequently injected into slug B0.25PV, termination of pumping；
(7) positive water drive experiment is carried out, stops experiment when being driven to aqueous 98%, records oil pump capacity, and it is final to calculate rock core
Recovery ratio value.
9th, oil-displacement capacity evaluation such as following table：
Learnt from above-mentioned data, prepare profile control agent using simulating oil field produced water, driven in the case of 50 DEG C of oil reservoir is simulated
For experiment, after implementing profile control to simulation core, improve rock core anisotropism, improved recovery ratio 25.26%, illustrate present invention tune
Hypotonic duct type Reservoir Heterogeneity can be improved by cuing open agent, and profile control effect is obvious.
Embodiment three：
1st, profile control agent application method：(1) sudden and violent oxygen processing is carried out to preparing water first, will prepare content of oxygen dissolved in water reduces
To below 3mg/L；(2) under the conditions of 55 DEG C of temperature, medicament is added to preparing in water, at the uniform velocity stirs 6 hours, obtains profile control agent；(3)
Profile control agent is directly injected into rock core after the completion of preparation.
2nd, water is prepared, by adding solubility salt regulating mineralization degree of injected oil into distilled water, final salinity is 35000mg/
L, to simulate the oilfield sewage used in actual production.
3rd, concrete medicament application amount is：
Slug A：Sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), calgon, sodium sulfite, salicylic acid, citric acid aluminum
Amount is than being 2%：0.15%：0.4%：0.6%：0.3%：0.25%, remaining components are preparation water.
Slug B：Cocoanut fatty acid diethanolamide, dodecyl sodium sulfate mass ratio are 2%：2%, remaining components are
Prepare water.
4th, specific rock core manufacture scale is as follows：
Experiment rock core is quartz sand epoxy resin cementitious homogeneous artificial core, and specific size is 4.5cm*4.5cm*
30cm, perm-plug method 20*10-3μm2, and the zink rod of 5% volume fraction is uniformly added into rock core manufacturing process, it is long
The high 0.05mm of the wide 0.1cm of 0.3cm, to simulate oil reservoir duct；Mould is carried out to hypotonic duct type oil reservoir by manually manufacturing rock core
Intend.
5th, displacement oil is crude oil, viscosity 37mPa.s in the case of 70 DEG C.
6th, sealing characteristics test operating procedure is as follows：
(1) rock core to be used is put into acidproof core holding unit, positive displacement, 30% concentration dilute sulfuric acid of displacement, until
Continue to inject dilute sulfuric acid 5PV, distilled water 5PV after producing without gas in rock core, to ensure that zink rod total overall reaction is discharged with dilute sulfuric acid,
Rock core is taken out after injection；
(2) rock core to be used is put into 70 DEG C of insulating boxs and is dried to constant weight, weighed its quality after taking out cooling, be designated as
m9；
(3) rock core after drying is put into saturation in vacuum pumping device and prepares water, when observation core surface bubble-free generates
Stop pumping, surface water is removed into rock core taking-up wiping, weighed, quality is designated as m10；
(4) rock core that saturation is configured to water is put into core holding unit, adds confined pressure 4MPa, then with 2mL/min speed
Into rock core, injection configuration water, records the pressure and flow when pressure stability；
(5) the positive injection slug A profile control agent 0.3PV into rock core, record pressure during injection profile agent, stand 24 hours
It is stand-by；
(6) water drive is carried out with 2mL/min speed, record outlet brings out the first breakthrough pressure when dripping, and treats that pressure is steady
The time recording pressure and flow；
(7) whole experiment is carried out in the case of 70 DEG C of constant temperature, is permeated after calculating original permeability according to record result, block up
Rate, sealing ratiod, breakthrough pressure gradient, resistance coefficient.
7th, sealing characteristics evaluation such as following table
Permeability is permeability after zink rod discharge before stifled, from the above in can draw, slug A profile control agents are to simulation core
Profile control effect is obvious, simulation duct formed firm closure, non-sealing region still has certain fluidity, illustrate the profile control agent and
Simulating oil field produced water is combined without negative effect, and leaves seepage channel for follow-up slug B.
8th, oil-displacement capacity test operating procedure is as follows：
(1) rock core to be used is put into acidproof core holding unit, positive displacement, 30% concentration dilute sulfuric acid of displacement, until
Continue to inject dilute sulfuric acid 5PV, distilled water 5PV after producing without gas in rock core, to ensure that zink rod total overall reaction is discharged with dilute sulfuric acid,
Rock core is taken out after injection；
(2) rock core to be used is put into 70 DEG C of insulating boxs and is dried to constant weight, weighed its quality after taking out cooling, be designated as
m11；
(3) rock core after drying is put into saturation in vacuum pumping device and configures water, when observation core surface bubble-free generates
Stop pumping, surface water is removed into rock core taking-up wiping, weighed, quality is designated as m12；
(4) with 1.5mL/min speed into rock core saturation crude oil, be driven to the port of export no longer water outlet when termination of pumping, record is tired
Count water yield, stand 4 hours it is stand-by；
(5) rock core of the complete crude oil of saturation being put into core holding unit, whole process experiment is carried out in the case of 70 DEG C of constant temperature, with
2mL/min speed carries out water drive oil, be driven to the port of export it is no longer fuel-displaced when termination of pumping, record oil pump capacity and recovery ratio；
(6) with the positive injection slug A profile control agent 0.3PV of 0.9mL/min speed, placed 24 hours after having noted, then note
Enter to prepare water 0.2PV, be subsequently injected into slug B0.3PV, termination of pumping；
(7) positive water drive experiment is carried out, stops experiment when being driven to aqueous 98%, records oil pump capacity, and it is final to calculate rock core
Recovery ratio value.
9th, oil-displacement capacity evaluation such as following table：
Learnt from above-mentioned data, prepare profile control agent using simulating oil field produced water, driven in the case of 70 DEG C of oil reservoir is simulated
For experiment, after implementing profile control to simulation core, improve rock core anisotropism, improved recovery ratio 24.66%, illustrate present invention tune
Hypotonic duct type Reservoir Heterogeneity can be improved by cuing open agent, and profile control effect is obvious.
Claims (6)
1. the double slug compounding profile control agents of a kind of hypotonic duct type oil reservoir, it is characterised in that including slug A profile control agents and slug B；
Slug A profile control agents include sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), calgon, sodium sulfite, salicylic acid, lemon
Sour aluminium；Wherein polyacrylamide molecular mass is 400*104；In slug A profile control agents, sodium metasilicate mass ratio is 1%-2%, part
Hydrolyzed polyacrylamide mass ratio is 0.05%-0.15%, and calgon mass ratio is 0.2%-0.4%, sodium sulfite matter
It is 0.4%-0.6% to measure ratio, and salicylic acid mass ratio is 0.1%-0.3%, and aluminium citrate mass ratio is 0.15%-0.25%, remaining
The following group is divided into preparation water；And
Slug B includes cocoanut fatty acid diethanolamide and dodecyl sodium sulfate；In slug B, coco-nut oil fatty acid diethyl
Alkylolamides mass ratio is 1%-2%, and dodecyl sodium sulfate mass ratio is 1%-2%, and remaining components are preparation water.
A kind of 2. double slug compounding profile control agents of hypotonic duct type oil reservoir as claimed in claim 1, it is characterised in that the slug
Sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), calgon, sodium sulfite, salicylic acid, aluminium citrate mass ratio in A profile control agents
For 1.2%-1.8%：0.08%-0.12%：0.25%-0.35%：0.45%-0.55%：0.15%-0.25%：0.18%-
0.22%, remaining components are preparation water.
A kind of 3. double slug compounding profile control agents of hypotonic duct type oil reservoir as claimed in claim 1, it is characterised in that the slug
Sodium metasilicate, partially hydrolyzed polyacrylamide (PHPA), calgon, sodium sulfite, salicylic acid, aluminium citrate mass ratio in A profile control agents
For 1.5%：0.1%：0.3%：0.5%：0.2%：0.2%, remaining components are preparation water.
A kind of 4. double slug compounding profile control agents of hypotonic duct type oil reservoir as claimed in claim 1, it is characterised in that the slug
Cocoanut fatty acid diethanolamide, dodecyl sodium sulfate mass ratio are 1.3%-1.7% in B：1.3%-1.7%, it is remaining
Component is preparation water.
A kind of 5. double slug compounding profile control agents of hypotonic duct type oil reservoir as claimed in claim 1, it is characterised in that the slug
Cocoanut fatty acid diethanolamide, dodecyl sodium sulfate mass ratio are 1.5% in B：1.5%, remaining components are preparation water.
6. the application method of the double slug compounding profile control agents of a kind of hypotonic duct type oil reservoir, it is characterised in that comprise the following steps：
Step 1. combines oil field actual production design data profile control agent injection rate, injection rate and other injection parameters；
Step 2. carries out sudden and violent oxygen processing to preparing water, prepares water and uses oilfield sewage or source water, will prepare oxygen in water and contains
Amount is reduced to below 3mg/L；
Under the conditions of 15-55 DEG C of step 3. temperature range, in the mixing container, medicament is added to preparing in water, it is small at the uniform velocity to stir 4-6
When, obtain profile control agent；
Water injection well is connected by step 4. with stainless steel and supercharging device, starts supercharging device, profile control agent is injected into oil reservoir；
Static 18-24 hours make the abundant plastic of profile control agent after step 5. slug A profile control agent injection rates reach preset range；
Step 6. injects driven water-replacing 0.2PV, injects slug B, then carries out follow-up note and adopts operation.
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| CN201710663704.0A CN107384351A (en) | 2017-08-06 | 2017-08-06 | A kind of double slug compounding profile control agents of hypotonic duct type oil reservoir and its application method |
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| CN201710663704.0A CN107384351A (en) | 2017-08-06 | 2017-08-06 | A kind of double slug compounding profile control agents of hypotonic duct type oil reservoir and its application method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271031A (en) * | 2020-03-18 | 2020-06-12 | 中国石油大学(北京) | Low-permeability reservoir deep profile control-oil displacement method |
| CN114456783A (en) * | 2022-01-14 | 2022-05-10 | 西南石油大学 | Inorganic-organic composite profile control water shutoff agent and using method thereof |
-
2017
- 2017-08-06 CN CN201710663704.0A patent/CN107384351A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271031A (en) * | 2020-03-18 | 2020-06-12 | 中国石油大学(北京) | Low-permeability reservoir deep profile control-oil displacement method |
| CN111271031B (en) * | 2020-03-18 | 2022-01-28 | 中国石油大学(北京) | Low-permeability reservoir deep profile control-oil displacement method |
| CN114456783A (en) * | 2022-01-14 | 2022-05-10 | 西南石油大学 | Inorganic-organic composite profile control water shutoff agent and using method thereof |
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Application publication date: 20171124 |